CODEWITHSUNDEEP
rubymine
Sergey Blohin
Sergey Blohin

Reputation: 620

Method invocation may produce 'NoMethodError' in Ruby

I have some code:

# frozen_string_literal: true

require 'httpclient'

client = HTTPClient.new
response = client.get 'https://httpbin.org/get'

body = response.body

puts body

Why RubyMine have warning about Method invocation may produce 'NoMethodError'?

Upvotes: 1

Views: 3398

Answers (2)

Olivia
Olivia

Reputation: 1581

There's a corresponding issue on the RubyMine's tracker so you can follow it: https://youtrack.jetbrains.com/issue/RUBY-24592

Upvotes: 2

Sebastián Palma
Sebastián Palma

Reputation: 33420

Basically, any object that doesn't respond to the method that's being invoked will raise a NoMethodError.

class Response
  def body
    'hardcoded body'
  end
end

class ResponseWithoutBody; end

p Response.new.body
# "hardcoded body"
p ResponseWithoutBody.new.body
# `<main>': undefined method `body' for #<ResponseWithoutBody:0x00007fe903028e08> (NoMethodError)

In your case, if response returns nil, or any other object which doesn't implement body, then you're going to have a NoMethodError.

If you're pretty sure, you're never going to get nil after invoking get on client, then you can omit that warning message.

Upvotes: 2

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